XChangePointerControl(3X11) X11R5 XChangePointerControl(3X11)NAME
XChangePointerControl, XGetPointerControl - control pointer
SYNTAX
XChangePointerControl(display, do_accel, do_threshold, accel_numerator,
accel_denominator, threshold)
Display *display;
Bool do_accel, do_threshold;
int accel_numerator, accel_denominator;
int threshold;
XGetPointerControl(display, accel_numerator_return, accel_denomina‐
tor_return,
threshold_return)
Display *display;
int *accel_numerator_return, *accel_denominator_return;
int *threshold_return;
ARGUMENTS
accel_denominator
Specifies the denominator for the acceleration multiplier.
accel_denominator_return
Returns the denominator for the acceleration multiplier.
accel_numerator
Specifies the numerator for the acceleration multiplier.
accel_numerator_return
Returns the numerator for the acceleration multiplier.
display Specifies the connection to the X server.
do_accel Specifies a Boolean value that controls whether the values
for the accel_numerator or accel_denominator are used.
do_threshold
Specifies a Boolean value that controls whether the value for
the threshold is used.
threshold Specifies the acceleration threshold.
threshold_return
Returns the acceleration threshold.
DESCRIPTION
The function defines how the pointing device moves. The acceleration,
expressed as a fraction, is a multiplier for movement. For example,
specifying 3/1 means the pointer moves three times as fast as normal.
The fraction may be rounded arbitrarily by the X server. Acceleration
only takes effect if the pointer moves more than threshold pixels at
once and only applies to the amount beyond the value in the threshold
argument. Setting a value to -1 restores the default. The values of
the do_accel and do_threshold arguments must be for the pointer values
to be set, or the parameters are unchanged. Negative values (other
than -1) generate a error, as does a zero value for the accel_denomina‐
tor argument.
can generate a error.
The function returns the pointer's current acceleration multiplier and
acceleration threshold.
DIAGNOSTICS
Some numeric value falls outside the range of values accepted by the
request.
Unless a specific range is specified for an argument, the
full range defined by the argument's type is accepted. Any
argument defined as a set of alternatives can generate this
error.
SEE ALSO
Xlib - C Language X Interface
XChangePointerControl(3X11)